Ellis was formerly client services director and has been at the agency for six years.
She joined as a graduate account executive and has been responsible for overseeing major client accounts including Starbucks, Kimberley Clark and Jack Daniels. Ellis has also helped integrate new business accounts including Hovis.
Seligman said: "Chloe has been with Communicator since its early days and played a major role in the restarting of the agency in 2002 and our development since then.
"Her extensive experience in the company will ensure that we continue on our growth trajectory without sacrificing the values and attention to creative excellence and detail that have made Communicator the success it is."
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